Had too much time to open rigged vote (7)
I believe the answer is:
overate
'had too much' is the definition.
(as in having too much food)
'time to open rigged vote' is the wordplay.
'time' becomes 'era' (era is a kind of time).
'to open' means one lot of letters goes inside another (some letters create an opening in a word).
'rigged' is an anagram indicator.
'vote' with letters rearranged gives 'ovte'.
'era' put into 'ovte' is 'OVERATE'.
(Other definitions for overate that I've seen before include "Binged, glutted" , "Gormandised" , "got stuffed" , "consumed too much" .)